Responsive Y-axis in the Small Multiples

Hello PowerBI Community,

This is my first post here and I hope to find a solution to my problem or a least some leads to explore because I have been searching a few times now and I can't find anything easy to help me. 

Feel free to send me link to other messages in the community of people who had the same issue or that could help me.

Introduction:

I already created a graphic showing the evolution of consumption per day  for different cities (Picture 1). Since I have a hundred cities, I want to generate a graph per city. This is why I started using Small Multiples which gives me what I want : A graphic per City and a simple way to look at all the graphs only by scrolling down.

Picture 1:

My problematic:

Now, I have a problem because each city don't have the same size and so, don't consume the same amount. But the Y-axis of the graphs automatically updates making most of the graphs unreadable (Picture 2).

Picture 2:

My questions:

1. What would be the best way to solve my issue ? I looked at all the options of the graph but couldn't find anything helpful. I understand that the problem comes from the automatic value at the "end" option of the Y-Axis. Changing the value from automatic to a number fix the Y-axis which also don't look good.
2. Would the best way to create my own visual ? (I have no experience with that).

Thank you for taking the time to read and comment my post.

I wish you all a good day. 🌞